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Auto merge of #84965 - the8472:lazy-delayed-diagnostics, r=Mark-Simulacrum

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lazify backtrace formatting for delayed diagnostics

Formatting backtraces causes debug info to be parsed, which is superfluous work if the delayed bugs get cleared later.

Lazifying them results in these speedups for the UI testsuite:

|       | debuginfo = 0 | debuginfo = 1 | debuginfo = 2 |
|-------|---------------|---------------|---------------|
| eager | 31.59s        | 37.55s        | 42.64s        |
| lazy  | 30.44s        | 30.86s        | 34.07s        |
This commit is contained in:
bors
2021-05-06 11:29:29 +00:00
parent 1d99508b52 b98629bfbc
commit 109248a4eb
1 changed files with 22 additions and 5 deletions
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compiler/rustc_errors/src/lib.rs
+22 -5
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@@ -294,6 +294,7 @@ impl error::Error for ExplicitBug {}
pub use diagnostic::{Diagnostic, DiagnosticId, DiagnosticStyledString, SubDiagnostic};
pub use diagnostic_builder::DiagnosticBuilder;
use std::backtrace::Backtrace;
/// A handler deals with errors and other compiler output.
/// Certain errors (fatal, bug, unimpl) may cause immediate exit,
@@ -317,7 +318,7 @@ struct HandlerInner {
deduplicated_err_count: usize,
emitter: Box<dyn Emitter + sync::Send>,
delayed_span_bugs: Vec<Diagnostic>,
delayed_good_path_bugs: Vec<Diagnostic>,
delayed_good_path_bugs: Vec<DelayedDiagnostic>,
/// This set contains the `DiagnosticId` of all emitted diagnostics to avoid
/// emitting the same diagnostic with extended help (`--teach`) twice, which
@@ -388,7 +389,7 @@ fn drop(&mut self) {
if !self.has_any_message() {
let bugs = std::mem::replace(&mut self.delayed_good_path_bugs, Vec::new());
self.flush_delayed(
bugs,
bugs.into_iter().map(DelayedDiagnostic::decorate).collect(),
"no warnings or errors encountered even though `delayed_good_path_bugs` issued",
);
}
@@ -968,12 +969,12 @@ fn delay_span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) {
}
fn delay_good_path_bug(&mut self, msg: &str) {
let mut diagnostic = Diagnostic::new(Level::Bug, msg);
let diagnostic = Diagnostic::new(Level::Bug, msg);
if self.flags.report_delayed_bugs {
self.emit_diagnostic(&diagnostic);
}
diagnostic.note(&format!("delayed at {}", std::backtrace::Backtrace::force_capture()));
self.delayed_good_path_bugs.push(diagnostic);
let backtrace = std::backtrace::Backtrace::force_capture();
self.delayed_good_path_bugs.push(DelayedDiagnostic::with_backtrace(diagnostic, backtrace));
}
fn failure(&mut self, msg: &str) {
@@ -1042,6 +1043,22 @@ fn panic_if_treat_err_as_bug(&self) {
}
}
struct DelayedDiagnostic {
inner: Diagnostic,
note: Backtrace,
}
impl DelayedDiagnostic {
fn with_backtrace(diagnostic: Diagnostic, backtrace: Backtrace) -> Self {
DelayedDiagnostic { inner: diagnostic, note: backtrace }
}
fn decorate(mut self) -> Diagnostic {
self.inner.note(&format!("delayed at {}", self.note));
self.inner
}
}
#[derive(Copy, PartialEq, Clone, Hash, Debug, Encodable, Decodable)]
pub enum Level {
Bug,